treatment early because the shift ended at 11PM. No treatments were made on the I35N
route because the garage anticipated that the higher traffic flow on I35 would keep the
road warm enough to prevent any potential ice formation. The road temperature
algorithm does not currently take into account heat from vehicles, so the temperature
differences on the route are primarily caused by the differing profiles and heat retention
properties of the underlying pavement. RWIS verifications of road pavement
temperatures (Fig. 11.27) indicate that there was a differential along the routes, but that
neither route ultimately experienced temperatures below 32 F (although the <33.5 F
period did verify).
Fig. 11.26. Forecasted precipitation, road temperatures and recommended treatments
along with actual treatments for I35N Ames route on January 16-17.